A faster encoding & decoding technique was successfully implemented. The technique is the default technique used in Chromium and is implemented using multiple encoding & decoding tables which saves a number of clock cycles during encoding and decoding. The source of the original Chromium technique can be seen bellow.
https://github.com/client9/stringencoders/tree/master/src
https://github.com/client9/stringencoders/blob/master/src/modp_b64.c
https://github.com/client9/stringencoders/blob/master/src/modp_b64_gen.c